Bad service and dishonest

i took my car to Renault woodmead in a good working condition for service on the 25th of November 2017 took it back the same day later on during the day the following morning while going to work my oli light indicator went on and as i was stoping the vehicle the engine turn off and i quickly went to check the oil only to find the was no oil in the vehichle , which i than called renault to ask how come they than went with to pull the car to have it checked a few hours later i was told the vehicle's oil pumb is damaged hence the oil was not found in the vehicle was than advised it was not them and the there was no way they could have seen the oil pumb because they where only doing manner service and i was given a qoutation of R50000 for them to fit a new engine i than went to the dealer to get my car so i have it check myself on to find the vehicle's oil pump is in good working condition, no internal/external damage to the oil pump assemble. the engine 's crankshaft has seized due to damage to the crankshaft bearings ( big end bearings ) running dry Vehicle's oil pan and block are not damaged nor leaking but the vehicle's engine seized due to a lack of oil present causing the engine to run un-lubricated. Wet oil pan guard indicating oil leakage through the oil pan drain plug.